毕业设计论文-基于DPPC2006的数字音频功放电路的设计.docVIP

 基于DPPC2006的数字音频功放电路的设计 摘 要 随着电子技术和数字信号处理技术的发展，音频功率放大器的发展进入了一个新时代，数字功率放大器已经在很多场合下取代了模拟功率放大器，而且关于数字功率放大器的相关技术也在得到不断改进和发展。 本系统以采用直接数字放大技术(DDX)的专用数字音频信号处理放大芯片DPPC2006为核心，可直接输入S/PDIF同轴或光纤数字信号经过内部运算，将PCM信号转化为PWM信号输送给高速VMOSFET管构成的互补对称H桥电路放大，输出放大后的双通道音频信号。通过使用不同的MOSFET，很容易得到80W～300W的输出功率，理论上平均效率可达到90%以上，甚至后级放大管完全不需散热片。使用单片机进行灵活控制，实现静音、数字音量调节、显示等功能.ABSTRACT With the development of electronic technology and digital signal processing technology, the development of audio power amplifier into a new era ,the digital power amplifier has been replaced the simulated power amplifier on many occasions, but also on the digital power amplifier technology has also been related to the continuous of improvement and development. This system uses the special-purpose numeral tonic train signaling processing enlargement, DPPC2006 of the direct digital enlargement technology (DDX) as a core. It is can directly input S/PDIF coaxial or optical digital signal .After the internal operation, transport the PWM signal to the supplementary symmetrical H bridge electric circuit which constitutes for the high speed VMOSFET tube enlarges the PCM signal transformation, output the double channel tonic train signaling that is enlarged. Through use different MOSFET, we can get the output between 80W to 300W easily, theoretically, the average performance may achieve above 90%. Even the level amplifying tube completely does not need the radiator fin. Uses the monolithic integrated circuit can nimble control it, realizes the foundation that obtained the static sound, numeral volume control and demonstration. KEY WORDS the audio power amplifier DPPC2006 the digital audio power amplifier 目 录 中文摘要 I 英文摘要 II 1 绪论 1 1.1 数字功放的目的及其意义 1 1.2 数字功放的国内外发展现状和前景 1 1.3 设计的主要内容 2 2 硬件电路设计 3 2.1 DPPC2006芯片外围电路的设计 3 2.1.1 DPPC2006的数字音频功放电路组成框图 3 2.1.2 DPPC2006的引脚图和功能框图 4 2.1.3 DPPC2006的概述、特点和技术指标 7 2.1.4 DPPC2006的工作原理 9 2.2 DPPC2006专用时钟电路设计 11 2.3 单片机控制及显示电路的设计 12 2.3.1 单片机AT89S52的性能及功能特性 12 2.3.2 单片机AT89S52的外围电路 13